Joists have X-bridging at mid-span, and are capped with 4-in. You would still have a soft floor because you would need 9 of them to replace the stiffness. The steel patch shall, as a minimum, be of the same thickness as the receiving member and shall extend not less than 1 inch 25 mm beyond all edges of the hole. What if a pool table or something large was placed on the floor. Would I need to tension it equally on the other side? Raise deflected joists with jacks, either tall flooring jacks or 4-byinch posts with a screw-type hydraulic jack under the bottom end. This would be the more expensive solution.
Check the floor in both directions to determine whether a single joist is affected or several neighboring joists may be sagging. Add extra 4-byinch support posts under the sagging joists or bands to further strengthen weakened joists. I'm piffin out a here. Unless the minimal reduction in the headroom below the stiffened floor is paramount, I would prefer the addition of a wood re-enforcing lumber to the bottom of the joists over the use of steel straps. Where sheathing material is attached to the top flange of ceiling joists or where the bracing is spaced closer than third point of the joists, the "third point" values from Tables R
Pleasant Valley Homes — Superior Construction
The strength of the steel is utilized entirely, and the epoxy transfers the loads continuosly instead of just at the fasteners. Next I turned each joist into a bowstring truss. Even a flitch design a steel plate between 2 pieces of lumber requires as a minimum clenched nails, and I would never allow those. Is there a difference between the two in this application? The angle iron seems to work for paul, but it is far from a good choice in most situations.
Since the floor upstairs will get replaced eventually and I can fix the subfloor then, I want to try to make the joists right now while it is open below. What is the purpose of liquid nails when sistering joists. Unless the minimal reduction in the headroom below the stiffened floor is paramount, I would prefer the addition of a wood re-enforcing lumber to the bottom of the joists over the use of steel straps. Truss members shall not be notched, cut or altered in any manner without an approved design. Holes shall have a minimum distance between the edge of the bearing surface and the edge of the web hole of not less than 10 inches mm. The loads under each and every fastener on the wood side must be examined for bearing pressure and held to below about PSI depending on the actual wood species used.